MAIN CHOICES AND PRELIMINARY DESIGN FOR THE IFMIF RF COUPLERS

IFMIF (International Fusion Material Irradiation Facil-ity) is the future neutrons irradiation facility that aims to qualify advanced materials for the fusion reactors successor to ITER (International Thermonuclear Experimental Reac-tor) [1]. The required neutrons flux is created from the ir-radiation of a lithium target by two high intensity deuteron ion beams (125 mA @ 40 MeV CW) produced by two par-allel linear superconducting accelerators. The niobium cav-ities are Half Wave Resonators (HWR) at 175 MHz operat-ing at 4.4 K. All cavities are equipped with the same power coupler designed to transfer a maximum power of 200 kW in CW. The present phase of the project, IFMIF-EVEDA, for Engineering Validation and Engineering Design Activ-ities, is aimed at the validation of the technical options fo